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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ec21c501e881b23c30266dfea42ef030f39ec25f9f2cc4929cd41a6ea68f30' 
  AND token = 'OvOemSlzPI776P7LMGn8MTctkfQ9yhAq2oSIMo3eH04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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