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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2512c11b88bb7defcc4b8ddcf975aef6e77f597a698f34e9a8966410403d002d' 
  AND token = '2iuTNjjfiRbU09IqJtJ/Nx2xMd1xonn7+C5PBOoXjqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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