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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d82b01e3ef3667b8d80f8e59e4f1127b1d1c563b8f0b131d7bcd483c7217a9' 
  AND token = 'gZ1+aiAVcjyN5vcRjzNOOgZS3GF86IJY2v5wxVA3gWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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