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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045659329d2d605c7101b6144ae3976a9283abbb1ab7978cc7a6b0362857c394' 
  AND token = 'tJEhIyGhsLncR9jJ05H8InPktJ0VPTpKBaHnq11OlEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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