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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b65a08f104c0a41a132409139250c3432514229d866f25479b77a5f06daa57' 
  AND token = 'oMoPHZWTEFXd2Q1QAk2SOkuWUPC1NF+udp9o8zrNSDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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