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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a6906aee4da797a9e8b01311a8adfff3992e4fec80ea0a6cabf1d583fccbef' 
  AND token = 'OIQJgIds7991JRKgwtYyNn7Y1IsDrdGuPT9KPpthsrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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