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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f8967bdff48a5888bbaf18b0b0cd04a17c0141baff903ac03a350bbc6e9c3b' 
  AND token = '0SqLm22mgUSmCDyzBj/2duHj07Ce+k05GHtk4bkZuGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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