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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b21d3fff2b5ea812639f4601ec6ec356fc16b94a3b410858e310ca7503dc58' 
  AND token = '4IjwInp5ExYzwDC9Mrn7ZV84ivPVmA6YeRdVVXKy4Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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