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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1ffcbfdda527abe6a4a3b2fd8bc662207e78598a43f9dab6501f1fd8ea189a' 
  AND token = 'Z7kQ7twkJP0OYFS4fSGyJj+ki0j8QeruDy8YgeapXhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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