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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe90ac9efc284517d63fa720efa09083de571b6c845aba6aa65cfc1e17a97676' 
  AND token = '65DKsxHjFFu70GUSi+Q1qFW4WHlua7A+IWPhXiCMY+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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