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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd554362d96cf95d3531f750d90269ad06096939948f2a4eec1b9e8a90b1b0b' 
  AND token = 'smqeMobW37Un5jSuf2UPnDF0tWpsSnzYh0Jn6+eXfYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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