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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe7a9cadd2ce4e9049ccc4bc1671706fbc89ba3793a1ece6d82534600d7a951' 
  AND token = '+9JOUrI8UVd/GI5aWWJCxLecTwudWWLEyNY2qIG7C38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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