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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b57ea1896a7dfbd3db4ca6a4fae4b45faf82ecb636bc60815293340d0b2c591' 
  AND token = '4rGKnY2Ds4p6wb8/Emt9O/fTfqHXs6kLt06JhB482mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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