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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345e28e81276302db0a41f4e95a4207fbbd685a25bac912c8c27f4e8700174d5' 
  AND token = 'jY4by4kF5c4QmH1CWgl3YaE2AW1zVV2QvT7lOr5Ajp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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