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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db375ac96831381ad57f34ed132862e272676be12a1c763528bc950ec581fc45' 
  AND token = 'SA/cf0sOigfx2RGPKfF+JpwVwd1iMqUdz/fMnkNR+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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