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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b06d86542e6d44d635ee849932111e35ce78be51cc8f82134f8d8feb694f060' 
  AND token = '5t6bqwoVBtPVZDmD4lPdFYdd/mF2TNYaglDSmudcpTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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