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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c90dad18108ce03e1bbc9c2863e2362696e50ec58c20f33ecc79bfd0f870a3' 
  AND token = '3BB32hU/djS4WpVyrJ2T4rtVtObzEAoQvGB7a9rjwTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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