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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735ee960dae6d3ced39aafddacb2ca0bd1dd6f712f5c0c712c9a687a830cb1e7' 
  AND token = 'VgW94XdvxPO4/a0HrzdXUY/H5AIkDyD8Svh7hcYTaxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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