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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04878f7be29f69f7b42ee3574fa99007d0e6e807aae23683776b33370e77d6f9' 
  AND token = 'mbeWpTDHWdAYd1FcpflEaFPsZBLPLBQv/IA693OW55U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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