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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7814462f366a02c93157b06d9cfb7e1989a3c2e5513c236e9c9a536372e064ae' 
  AND token = '8pNrQ2vmm5PvDaHBFJf1Q5zDULZzUY8lmq42FUQ4++4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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