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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbf436cb63266a7f831c75efc3384f641978f8a486cfcc62ac619baa4c636b0' 
  AND token = 'wEztDfsJlKpdfeGa9awSu8yyoL4P+R9yCp/hoeV+8l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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