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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88eb628512b1ce1c1352a551da1e2c7e17240ead5873c42855f36628308c6e7' 
  AND token = '4kQStK/fDFnZlx0ESzVfL3A5dAd1y01ENd0cvsXGsSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}