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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb21ff8b19f38c76709ab074f9772000244a9a47ab6e9588e4afff1c7c4ac8e7' 
  AND token = '1wepNulI9D5lQz6m5nG3UXibt3ZZPLFXSklg2Nn7+ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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