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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31bf821f8dbab411f2aaaf35c7ee0523c10601bb27788cac2f9a30550114e73' 
  AND token = 'upQj0YMVCj4Ga75wSLSn1pHueXDK+tj+5KJK9Uo954M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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