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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7425b4cd42d557b5e4b14a45108a95d955d1f277114745489b1586ccc246389' 
  AND token = 'b7yjSiPFBjz/4dt73WPWTLk7+wmc6b078GEGLxknah4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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