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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ffec4390e27ee73bd3c092a592a209184b6c3a3ce91b2511a13d7633e356b9' 
  AND token = 'cvGeY8Z6jBtHvTLX5PR4Hs7kIJL5EilbqbJgQdKgMcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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