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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dbe84c060844b8e5abb10a729b399e6f53a0ca8ebe475389b12b57e3873fe7' 
  AND token = 'HRvWioKymu9eT/50Y98WqH1//bNVNoggP23NHvGI8jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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