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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494355181bd28172ffebcf9be6c0b48dd13dcd9903f810f81e9fab3e34c20a99' 
  AND token = 'QiW03d+yyD9BreVd3gYHL2ypZH+11PplpZOR5cdhuLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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