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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6984ea6adb6c452ff44a51240ee967f3794afd9763fff9cd5820458fc1774a' 
  AND token = 'WMqmRJucQgKKu17nxdAiZPe5RADnDds/g2dlS3gZ1sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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