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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e906f13414fbb934afb9699bdbedff77bc9650d105d4b31036415f8eb88a75' 
  AND token = 'NlTfSmb8ugX+VfjmozJ2nxzI8Cc4U2glCME/HALd3zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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