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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9576c49da88c08432fc7242fa11aedcefa5b7f40b381e4f0bcac024ade81b771' 
  AND token = '0LqB6LkbB9DLzaIJau7WHz4OdqC9em7Dd5HRJx28x/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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