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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dce020bf9cea624162943b65991a70a99f9ea4a5b1c34ea0ad8ea6e7eca0bf7' 
  AND token = 'R2vh736LAuJPogor8RhM2cWBlXM6ddnuuYIGa2XcyJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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