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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90137a59bf684f5c5f7c632217034254f98a872a7e617bc36cd32c7e3c107c49' 
  AND token = 'yLMP3jreJGCrviOcw8XlJ+N1ek8dPsqMSSm5eKAvhmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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