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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95f5eabc5b4a09740abfef4fdb2d350739a1f93ab5378490aa14df90f08c1a2' 
  AND token = 'ksY84VYuTJDT+ASfKmnltU891Z/oK+9ox2W/ec1rWaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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