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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9685d76dddc8f2c7cd116b9bbcf7aa00603bd86ee9f95e918f42458eb1720c0a' 
  AND token = '7aSy7eOXRolH9N7kWhD36TCacMLlaPP4HnePFs0SDi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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