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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daba2df713df249da049f43b4a0dc4bd996613358777f01ef6c4e84af6ad7b9b' 
  AND token = 'LOJH3QojkyfG8r5Sz6c8ze4DWvIIPDpXKruOH18mAqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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