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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4194ce60aa7e71b1e380cbec530ed62e4c41a7ea6b526e75a7195d803ecc1dca' 
  AND token = 'VmHuMQBfglKmUylRTn8WWZMDeMZI8rDRcqk5PIaSe4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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