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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7567af67b7ca6e980cd9bfa7b2b8a435c9e18e31d4d7b69dcae735f6e4c279a2' 
  AND token = 'uLA+RfV0r9N7PFCfHSKpVxMNeQb6J9hs3lHZCDS1qvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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