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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37a147cb38e1323eb60940b6beacf4680b66a5bac0220baa44d5474347431a8' 
  AND token = 'Ax2c9fHprYG5dv5+UDhgIyNY2aIJ6Ns2Jc48QcReYOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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