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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddede795e841e5d7d32e3c6f46d81ef1596f8cba6df24942fb0e7838fc13ee02' 
  AND token = 'VA2+AWM/b7lR0IxYaxG4ZbQLb/b0jAjomfpzK4JRLiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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