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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6940905eb6bf7a3831fca0edcf306a704336ad1b7d3a6dc8fd27585fe6dd597e' 
  AND token = 'UselreMaIJlDLdBU/r84oGp1i7PvPdmeRxtRmtpP46Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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