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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd24b9dcd6baea86b24680b9e13d645f3a93ad04d37fc15f753f7e5de3d608f4' 
  AND token = 'i8HkuaIMA726iBB2g8OV86yz+S/XWxweTgT6R85YaN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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