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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ec384b878c9fa15eeacafdef1490870637c60b30a9428b502f4df98a8cd841' 
  AND token = 'eNVlrLuZlJIslaQh28GF1sqL3oM5L/t5XOLqg7kklLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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