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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08bf0a8d7839ca3ff15f75d67fcbca1f6f3f0df44c1c655e3e9e3cc93153f33' 
  AND token = 'rWzG7i4/ZLUgB/FT+8UfXo3aqx1eSNeuUJAMmu27fXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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