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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c5d0f968dc7908b59e0616424d29275115421dba63d29308ec9f012a6dd213' 
  AND token = 'p7LXCxUQt9MUzRmYX+Thoz9fIXddPh+F4yC4Ad7Pgb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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