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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9049891cb272adbcb6f46e42b6f948bc9537d83ce91b37023abf3be8e27612a4' 
  AND token = 'S1TICkeTCsiM6hlC9LBimY+n8FMYLwSgcog6YVMhIXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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