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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703f3c477d73aef35080d576130ad22b4bf5fa07bbdca7e327d28df621dfe48c' 
  AND token = '7RUOV6yKgxJxBlKzJofleWRbth/d9t29LkokIJV+J4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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