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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02aabd81382585ed3edd8d7b3a49abf7ae4a714eeb96a77e195e83e96d51c2c' 
  AND token = 'flT7Qgoc/WjvTogTDOr82qjWxXvzXAWQMDGC2IjJ6nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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