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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c76e4ce7380aeb1dd166e93bed8a20532c6bf2ddc40629d614a4f9b7d751dd' 
  AND token = 'GXJxhzbSQtvpyMKaGYvKhKEzQD1ec9MeL8Vho4u8AWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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