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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab097b1a0d050ecff23549a5ab33598a3046f8b293c178cae869c2eb7d5bd966' 
  AND token = 'co2ZlOiA8ODbPw6Zo8TPWBIAIoxJHETjgT4ESLxjQz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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