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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40dcc407b0871b8885a6a9cb9deeb6e98107d9a661f57ab71983ce1dc02b9b63' 
  AND token = 'ErRPT13cMxS0Faf/8NcQOp9W8xXALSs+nmqtKqaRgvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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