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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db715f3d55e2eeb6d30d8a4982690d047ab522eb920899b3b4502e4f0b1f28ac' 
  AND token = 'xF/FqbMEEoRDueJL6IGQhCRdOe+sheUJjLQj/qTinlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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