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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d343b17f81cbdd0fc6debac1e6234994622b1fd4f492a1ebafc515925ab5c5' 
  AND token = '3pEwpFm0UZujI+6uScK/SBboIWxVOhOApZ1PpLULWA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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