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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e12944b3e66c7d85ea1a8c1c553b14fa29230a7a70abfafc9ed2608b4b7ee58' 
  AND token = '3R5Sq/unYG1QATA62CK7s3omKVKQXuQOQFEJN2PUS5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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