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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c97ae1e7a4802b00b29cc1db844072d0957097badca7a809ce2f6a03aed801' 
  AND token = 'PHp60opMq6F54bUMQRq28CtKE9VVgNcpftZMrONlRX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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