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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fa273982c4f4306f3c8c42c1fdf61d611248753e4a16740538794b4116c3a8' 
  AND token = 'J6jpylzJGJ091z4dFKm0Ml+s/XKGZlm7G09gsMMcM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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