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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0283019273d21c5e3cc915b8f9cc8ca750fe5de572a9a3ae9b9577baa20dbf' 
  AND token = 'sIHVYDOVjlzuexg2VXvtv56qqKI7mLsfWyym7j4inm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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