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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495b59702e668cd9d3f984367469622e794a70af520f7cb877d0ef06cbc7de69' 
  AND token = 'UfAoZ14sVHyEwrDD5DdV+EoB2Qxl+7NwLNqhbZtNUxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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