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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b341e79d3b752d83f55dbf959d85b028a3e44a4a09faaa2a8ce27802451997' 
  AND token = 'D998fHlAurvzSO65k8XXpqwLQTOH8O822DKXVxMEPRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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