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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b8333298ba115619f74820f997e943c4a9997a8000ef063005fa3ca02f4422' 
  AND token = 'whlO29VtFwNuie4fAMd8vVbpVira8McrW64KnUGW1PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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