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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a76b6d49eb92de739d559f7e91c0c8c3020f224c2be17369f88ee7f5c7f6c60' 
  AND token = 'wHPEVPzpOFRH6+G89CkkWOzhBeV6o1mBiRVaQ0Ixnmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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