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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58257c5e1e0cc2c5d6febcbe9e3bf45e051b7ba5b0ba3d98577de414ec26beab' 
  AND token = '5wQ/UrCkpM4tJNS2vlbLljQI8JpDoXX98xnFBXXNu/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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