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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16986d34aba9da1c1f5c4f3d18a5068451f526cd4aaa9ca824e40cc8fad23b67' 
  AND token = 'AMPz7IhiSbohxNk/KazwAW2QwuBODcE+lPLLv/fw0gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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