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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246393ebf6faf24daccbf8d02d7640fcb30e70f087e131675ee65d6671caf845' 
  AND token = 'GXMGnqVu1NZEo/xhZOObaGtfBJ2K19UPIGppX0t3+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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