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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498a9fe815215ad0454dffa7952012f53af00cb011523aa3d5e655bf87cd80fb' 
  AND token = 'clblheHRXjMLTQw32sewIv9jgA7QF4Y+3HL3teF1s/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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