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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22411b5a30b51b435c7d28a9b3d5bd25669fa384ada1c41b4ad84f7fc327cea6' 
  AND token = 'xozlYNuiFhTxkVCO2D4TCMRk+LlEC+XAThRqox5iIEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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