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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354631aa02f695e52f88acdc4260b1e4003ee1c55003ecff5d7e7ff886f6dbbb' 
  AND token = 'qCK1t6RHxJ5RNgmZJmwK1U9rbD22rxRHQoPcSmT/2Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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